Not for the faint of heart. This mod takes a bit of work and experimentation (BiTs test 2 Bump sensor) to tweak your work to make sure the sensors can trigger and release using just the springs attached to the bumper assembly.

First some disassembly is needed to reach the main circuit board that must be freed from its mountings so that it can be raised enough to free the two bumper 90 degree arms so that the two rubber finger protectors can be slid onto the arms then inserted back into the bump sensor and then stretched to the back of each bumper mount that is attached to the PCA.